[Stackmap] Add AnyReg calling convention support for patchpoint intrinsic.

The idea of the AnyReg Calling Convention is to provide the call arguments in
registers, but not to force them to be placed in a paticular order into a
specified set of registers. Instead it is up tp the register allocator to assign
any register as it sees fit. The same applies to the return value (if
applicable).

Differential Revision: http://llvm-reviews.chandlerc.com/D2009

Reviewed by Andy

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194293 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp
index 0cb9ac38bc..75987157dc 100644
--- a/lib/Target/X86/X86RegisterInfo.cpp
+++ b/lib/Target/X86/X86RegisterInfo.cpp
@@ -239,6 +239,10 @@ X86RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
   case CallingConv::HiPE:
     return CSR_NoRegs_SaveList;
 
+  case CallingConv::WebKit_JS:
+  case CallingConv::AnyReg:
+    return CSR_MostRegs_64_SaveList;
+
   case CallingConv::Intel_OCL_BI: {
     bool HasAVX = TM.getSubtarget<X86Subtarget>().hasAVX();
     bool HasAVX512 = TM.getSubtarget<X86Subtarget>().hasAVX512();
@@ -296,6 +300,8 @@ X86RegisterInfo::getCallPreservedMask(CallingConv::ID CC) const {
   }
   if (CC == CallingConv::GHC || CC == CallingConv::HiPE)
     return CSR_NoRegs_RegMask;
+  if (CC == CallingConv::WebKit_JS || CC == CallingConv::AnyReg)
+    return CSR_MostRegs_64_RegMask;
   if (!Is64Bit)
     return CSR_32_RegMask;
   if (CC == CallingConv::Cold)